GO:0140999 histone H3K4 trimethyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140999 describes the enzymatic activity that adds three methyl groups to lysine 4 of histone H3, producing the H3K4me3 mark.
• This activity is carried out by SET-domain-containing proteins such as Set1 in Drosophila, MLL1 in humans, and SDG2 in Arabidopsis.
• H3K4me3 is a hallmark of active transcription start sites and is critical for gene activation, development, and stress responses.
• Dysregulation of H3K4 trimethyltransferases is linked to leukemia, cervical cancer, and inflammatory diseases.
• CRISPR-based knockout, point mutation, and knock-in models are essential to dissect the causal roles of these enzymes.
• Understanding H3K4me3 dynamics requires integrating genomic, proteomic, and imaging approaches.
Description
Histone H3 lysine 4 trimethylation (H3K4me3) is a chromatin modification that marks active gene promoters and is essential for transcriptional regulation. The enzyme responsible for depositing this mark, histone H3K4 trimethyltransferase, catalyzes the successive addition of three methyl groups to lysine 4 of histone H3 using S-adenosyl-L-methionine as the methyl donor. This activity is conserved from yeast to plants and humans, and its dysregulation is associated with developmental defects and cancer. Researchers study GO:0140999 to understand how epigenetic marks are established, maintained, and interpreted in health and disease.
histone H3K4 trimethyltransferase activity At A Glance
| GO ID | GO:0140999 |
|---|---|
| GO term | histone H3K4 trimethyltransferase activity |
| Ontology | molecular_function |
| Synonym | histone H3K4 trimethylase activity; histone H3-K4 trimethylation; histone H3K4 trimethylation; histone lysine N-trimethyltransferase activity (H3-K4 specific) |
| Major function | Catalyzes the trimethylation of histone H3 at lysine 4, producing H3K4me3, a mark of active transcription. |
| Cofactor | S-adenosyl-L-methionine (SAM) serves as the methyl donor. |
| Substrate | Histone H3 with unmethylated lysine 4. |
| Product | Histone H3 with trimethylated lysine 4 (H3K4me3) and S-adenosyl-L-homocysteine. |
| Localization | Nucleus, associated with chromatin. |
What Is GO:0140999?
GO:0140999 is a molecular function term defined as the catalysis of the reaction: L-lysyl4-[histone H3] + 3 S-adenosyl-L-methionine = 2 H+ + N6,N6-trimethyl-L-lysyl4-[histone H3] + 3 S-adenosyl-L-homocysteine. In simpler terms, it is the enzymatic activity that adds three methyl groups to the fourth lysine residue of histone H3, resulting in the trimethylated form known as H3K4me3.
Why Is histone H3K4 trimethyltransferase activity Important in Cell Biology?
Histone H3K4 trimethyltransferase activity is fundamental to epigenetic regulation because it establishes H3K4me3, a mark that recruits transcriptional machinery and correlates with active gene expression. This activity influences diverse biological processes including development, stress responses, and immune signaling. Its dysregulation has been implicated in hematological malignancies, solid tumors, and inflammatory disorders, making it a target for therapeutic intervention and a focus of intense research.
• Regulates gene expression by marking active promoters with H3K4me3.
• Essential for normal development in plants and animals.
• Involved in drought tolerance and biomass production in Populus trichocarpa.
• Plays a role in NF-κB-dependent inflammatory responses.
• Implicated in MLL1-fusion leukemia through aberrant H3K4 methylation.
• Promotes metastasis and angiogenesis in cervical cancer via KMT2B.
• Antagonizes Polycomb silencing through Trithorax-mediated H3K4 monomethylation and CBP interaction.
• Serves as a target for epigenetic therapies in cancer.
• Provides a mechanism for environmental stress memory in plants.
• Enables researchers to study chromatin dynamics using CRISPR models.
What Happens During histone H3K4 trimethyltransferase activity?
Substrate recognition and binding
In simple terms: The enzyme first finds and binds to histone H3.
The trimethyltransferase recognizes the N-terminal tail of histone H3, specifically the region around lysine 4. This binding is mediated by SET domains and accessory proteins that ensure specificity for H3K4 over other lysine residues. In Drosophila, Set1 is the major H3K4 trimethyltransferase and is recruited to chromatin through interactions with RNA polymerase II-associated factors.
Successive methylation steps
In simple terms: The enzyme adds three methyl groups one by one.
Using S-adenosyl-L-methionine (SAM) as the methyl donor, the enzyme catalyzes three sequential methylation reactions: from unmethylated H3K4 to monomethylated, then dimethylated, and finally trimethylated H3K4. Each step releases S-adenosyl-L-homocysteine (SAH). The reaction is processive, meaning the enzyme remains bound to the substrate until all three methyl groups are added.
Formation of H3K4me3 mark
In simple terms: The final product is a trimethyl mark on histone H3.
The trimethylated lysine 4 (H3K4me3) serves as a docking site for reader proteins containing PHD fingers, chromodomains, or Tudor domains. These readers recruit transcriptional coactivators and chromatin remodelers, leading to an open chromatin state and active transcription. In Arabidopsis, SDG2 is the major H3K4 trimethyltransferase and is essential for proper development and gene expression.
Integration with other chromatin modifications
In simple terms: H3K4me3 works together with other marks to control gene activity.
H3K4me3 often coexists with H3K27 acetylation at active promoters. Trithorax, a Drosophila H3K4 methyltransferase, interacts directly with CBP to promote H3K27 acetylation and antagonize Polycomb silencing. This crosstalk ensures robust gene activation and epigenetic memory.
Key Genes Involved in GO:0140999 histone H3K4 trimethyltransferase activity
The following genes encode enzymes or associated proteins that carry out or regulate histone H3K4 trimethyltransferase activity.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SET1 (Drosophila) | Major H3K4 trimethyltransferase | Role in transcription and development |
| MLL1 (KMT2A) | H3K4 trimethyltransferase | Implicated in MLL1-fusion leukemia |
| KMT2B | H3K4 trimethyltransferase | Promotes metastasis and angiogenesis in cervical cancer |
| PRDM7 | H3K4 trimethyltransferase | Identified as a histone H3K4 trimethyltransferase |
| SDG2 (Arabidopsis) | Major H3K4 trimethyltransferase | Essential for plant development |
| Trithorax (Drosophila) | H3K4 monomethyltransferase | Interacts with CBP to promote H3K27 acetylation |
| MKL1 | Defines H3K4me3 landscape | NF-κB-dependent inflammatory response |
| COMPASS pentamer (Populus) | H3K4 trimethyltransferase complex | Transactivates drought tolerance and growth |
| WDR5 | Core subunit of COMPASS-like complexes | Required for H3K4 methylation |
| RBBP5 | Core subunit of COMPASS-like complexes | Required for H3K4 methylation |
| ASH2L | Core subunit of COMPASS-like complexes | Required for H3K4 methylation |
| DPY30 | Core subunit of COMPASS-like complexes | Required for H3K4 methylation |
| SETD1A | H3K4 trimethyltransferase | Role in transcription and development |
| SETD1B | H3K4 trimethyltransferase | Role in transcription and development |
| CBP | Histone acetyltransferase | Interacts with Trithorax to promote H3K27ac |
| RNA Pol II | Transcription machinery | Recruits Set1 for H3K4 methylation |
| NF-κB | Transcription factor | Cooperates with MKL1 for inflammatory gene expression |
How Is histone H3K4 trimethyltransferase activity Regulated?
Histone H3K4 trimethyltransferase activity is regulated at multiple levels. Recruitment to chromatin is controlled by transcription factors and RNA polymerase II-associated factors. In Drosophila, Set1 is the major H3K4 trimethyltransferase and its activity is coupled to transcription. In humans, MLL1 fusion proteins can dysregulate H3K4 methylation, leading to leukemia. KMT2B expression is regulated by oncogenic signals in cervical cancer. In plants, the COMPASS pentamer transactivates drought tolerance genes, indicating environmental regulation. Additionally, MKL1 defines the H3K4me3 landscape for NF-κB-dependent inflammatory responses, linking signaling pathways to epigenetic changes.
histone H3K4 trimethyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MLL1 (KMT2A) | Leukemia | iPS cells with point mutation |
| KMT2B | Cervical cancer metastasis | Knockout in cancer cell lines |
| MKL1 | Inflammatory response | Knockout mice or macrophages |
| SDG2 | Plant development | Arabidopsis knockout |
| COMPASS pentamer | Drought tolerance | Populus overexpression |
MLL1-fusion leukemia
MLL1 (KMT2A) rearrangements produce fusion proteins that aberrantly recruit H3K4 trimethyltransferase activity to target genes, driving leukemogenesis. An iPS cell point mutation model has revealed epigenetic reprogramming that contributes to leukemia.
Cervical cancer metastasis
KMT2B promotes metastasis and angiogenesis in cervical cancer by upregulating EGF expression. Knockdown of KMT2B reduces H3K4me3 at the EGF promoter and inhibits tumor growth.
Inflammatory diseases
MKL1 defines the H3K4me3 landscape for NF-κB-dependent inflammatory responses. Dysregulation of this axis may contribute to chronic inflammation.
Plant stress and development
In Populus trichocarpa, a COMPASS histone H3K4 trimethyltransferase pentamer transactivates drought tolerance and growth, highlighting the importance of this activity in environmental adaptation.
From histone H3K4 trimethyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of H3K4 trimethyltransferase affect gene expression? | CRISPR knockout of SET1/MLL1 |
| Does a point mutation in MLL1 alter H3K4me3? | CRISPR point mutation knock-in |
| Can H3K4 trimethyltransferase be tagged for imaging? | Tagged knock-in of endogenous locus |
| Does overexpression of KMT2B promote metastasis? | CRISPR overexpression in cancer cells |
| What is the role of MKL1 in inflammation? | Knockout mouse model |
| How does SDG2 regulate plant development? | Arabidopsis knockout |
How to Study the histone H3K4 trimethyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ChIP-seq | Genome-wide localization of H3K4me3 | Mapping active promoters |
| RNA-seq | Gene expression changes | Knockout/knockdown studies |
| Mass spectrometry | Histone modification levels | Enzyme characterization |
| Western blot | Protein expression and modification | Validation of H3K4me3 |
| Immunofluorescence | Nuclear localization of H3K4me3 | Cell imaging |
| CRISPR screen | Identification of essential genes | Functional genomics |
| Co-immunoprecipitation | Protein-protein interactions | COMPASS complex assembly |
| In vitro methyltransferase assay | Enzymatic activity | Kinetic studies |
Chromatin immunoprecipitation sequencing (ChIP-seq)
ChIP-seq using antibodies against H3K4me3 allows genome-wide mapping of the mark. This method has been used to define the H3K4me3 landscape in inflammatory responses and to study MLL1-fusion leukemia.
RNA sequencing (RNA-seq)
RNA-seq measures changes in gene expression upon knockout or knockdown of H3K4 trimethyltransferases. For example, KMT2B knockdown reduces EGF expression in cervical cancer cells.
Mass spectrometry
Mass spectrometry can detect histone modifications and quantify H3K4me3 levels. It has been used to characterize PRDM7 as a histone H3K4 trimethyltransferase.
CRISPR-based screens
Genome-wide CRISPR screens can identify genes required for H3K4 methylation and its downstream effects. Such screens have been applied to study epigenetic regulators in leukemia.
How CRISPR Can Be Used to Study GO:0140999 histone H3K4 trimethyltransferase activity
Knockout
CRISPR knockout of H3K4 trimethyltransferase genes such as SET1, MLL1, or KMT2B allows researchers to study loss-of-function phenotypes. For example, KMT2B knockout reduces cervical cancer metastasis and angiogenesis. In Drosophila, Set1 knockout affects transcription and development.
Point Mutation
CRISPR point mutation knock-in can model disease-associated mutations. An iPS cell point mutation model of MLL1-fusion leukemia revealed epigenetic reprogramming. Such models are valuable for testing targeted therapies.
Knock-in
Tagged knock-in of endogenous H3K4 trimethyltransferase genes enables live-cell imaging and proteomic studies. For example, tagging SDG2 in Arabidopsis allows tracking of its localization and interactions.
Overexpression
CRISPR overexpression of KMT2B in cervical cancer cells promotes metastasis and angiogenesis, demonstrating its oncogenic potential. Overexpression models are useful for gain-of-function studies.
How EDITGENE Supports histone H3K4 trimethyltransferase activity Research
Researchers studying histone H3K4 trimethyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in a specific biological process or disease. EDITGENE provides a comprehensive suite of CRISPR services to enable precise genetic manipulation and functional interrogation of these epigenetic regulators.
Contact EDITGENE today to design your custom CRISPR model for histone H3K4 trimethyltransferase activity research.
Frequently Asked Questions About histone H3K4 trimethyltransferase activity
What is histone H3K4 trimethyltransferase activity?
It is the enzymatic activity that adds three methyl groups to lysine 4 of histone H3, producing H3K4me3, a mark of active transcription.
What genes are involved in histone H3K4 trimethyltransferase activity?
Key genes include SET1, MLL1 (KMT2A), KMT2B, PRDM7, SDG2, and Trithorax, among others.
What is the GO ID for histone H3K4 trimethyltransferase activity?
The GO ID is GO:0140999.
How is H3K4me3 related to cancer?
Aberrant H3K4 trimethylation is implicated in leukemia and cervical cancer, where it drives oncogenic gene expression.
What is the role of MLL1 in leukemia?
MLL1 fusion proteins recruit H3K4 trimethyltransferase activity to target genes, leading to leukemogenesis.
Can CRISPR be used to study H3K4 trimethyltransferase activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect the function of these enzymes.
What methods are used to measure H3K4me3?
ChIP-seq, mass spectrometry, Western blot, and immunofluorescence are commonly used.
What is the role of SDG2 in plants?
SDG2 is the major H3K4 trimethyltransferase in Arabidopsis and is essential for development.
How does MKL1 regulate inflammatory responses?
MKL1 defines the H3K4me3 landscape for NF-κB-dependent inflammatory gene expression.
What is the COMPASS complex?
COMPASS is a conserved histone H3K4 methyltransferase complex that includes subunits like WDR5, RBBP5, ASH2L, and DPY30.
Conclusion
Histone H3K4 trimethyltransferase activity (GO:0140999) is a central epigenetic mechanism that controls gene expression through the deposition of H3K4me3. Its roles in development, disease, and environmental responses make it a critical research focus. Understanding its regulation and function requires integrated approaches, including CRISPR-based models and genomic technologies. EDITGENE provides the tools and expertise to accelerate discoveries in this field.
References
- 1. Zhang B et al.. 2024. A COMPASS histone H3K4 trimethyltransferase pentamer transactivates drought tolerance and growth/biomass production in Populus trichocarpa.. New Phytol 241(5):1950-1972 PMID: 38095236
- 2. Ardehali MB et al.. 2011. Drosophila Set1 is the major histone H3 lysine 4 trimethyltransferase with role in transcription.. EMBO J 30(14):2817-28 PMID: 21694722
- 3. Kobrossy L et al.. 2024. Unraveling MLL1-fusion leukemia: Epigenetic revelations from an iPS cell point mutation.. J Biol Chem 300(11):107825 PMID: 39342993
- 4. Blazer LL et al.. 2016. PR Domain-containing Protein 7 (PRDM7) Is a Histone 3 Lysine 4 Trimethyltransferase.. J Biol Chem 291(26):13509-19 PMID: 27129774
- 5. Guo L et al.. 2010. SET DOMAIN GROUP2 is the major histone H3 lysine [corrected] 4 trimethyltransferase in Arabidopsis.. Proc Natl Acad Sci U S A 107(43):18557-62 PMID: 20937886
- 6. Tie F et al.. 2014. Trithorax monomethylates histone H3K4 and interacts directly with CBP to promote H3K27 acetylation and antagonize Polycomb silencing.. Development 141(5):1129-39 PMID: 24550119
- 7. Zhao D et al.. 2023. Histone Methyltransferase KMT2B Promotes Metastasis and Angiogenesis of Cervical Cancer by Upregulating EGF Expression.. Int J Biol Sci 19(1):34-49 PMID: 36594087
- 8. Yu L et al.. 2017. MKL1 defines the H3K4Me3 landscape for NF-κB dependent inflammatory response.. Sci Rep 7(1):191 PMID: 28298643
